Is search engine submission effective?

Though it seems that automatic submission makes the work easy but in fact it does not. Yes it is not effective. Why search engine submission is not effective? Because as a survey conducted from website marketers revealed their preference for manual submission over the auto-submission due to their distrust in the latter one. And most also mentioned going for auto-submissions only if they were inevitable and even then search engine submission was submitted only to crawler search engines. And those going for submissions also preferred to rely on software packages instead of the services offered on the World Wide Web. Examples of crawler search engines include search engines like Data Park Search.

What are Manual submissions?